Curtius; Bertho
Chemische Berichte, 1926 , vol. 59, p. 586
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Zhurnal Russkago Fiziko-Khimicheskago Obshchestva, 1929 , vol. 61, p. 2013
Chem. Zentralbl., 1930 , vol. 101, # I p. 3556
Fittica
Justus Liebigs Annalen der Chemie, 1874 , vol. 172, p. 305
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Justus Liebigs Annalen der Chemie, 1847 , vol. 63, p. 297